Health & Fitness Calculators
BMI, calorie, pregnancy and fitness calculators, aligned with NHS guidance.
62 calculators in this category
Alcohol Units Calculator ABV x volume / 1000. Baby Weight Percentile Calculator WHO growth centiles. Blood Alcohol Content Calculator Widmark formula. Add 'not for driving' note. Blood Pressure Category Calculator Classifies sys/dia reading. BMI Calculator Weight/height^2. Metric + imperial. BMR Calculator Mifflin-St Jeor. Body Fat Percentage Calculator US Navy method. Body Frame Size Calculator Wrist circumference method. Body Surface Area Calculator Du Bois formula. Caffeine Intake Calculator Safe daily limit + half-life. Calorie Calculator (TDEE) BMR x activity factor. Calorie Deficit Calculator Weight-loss rate from deficit. Calories Burned Calculator MET-based by activity. Cat Age Calculator Cat to human years. Child Height Predictor Mid-parental height. Childhood BMI Calculator BMI centile for age. Cholesterol Ratio Calculator Total:HDL ratio. Conception Date Calculator Reverse from due date. Cycling Calorie Calculator Speed/duration MET. Daily Calorie Needs (Child) Age/activity based. Dog Age Calculator Breed-size adjusted human years. Due Date by IVF Calculator From transfer date. eGFR Calculator Kidney function estimate. FFMI Calculator Fat-free mass index. Heart Rate Zone Calculator 220-age zones. Hydration During Exercise Sweat-rate fluid replacement. Ideal Weight Calculator Robinson/Devine formulae. Lean Body Mass Calculator Boer formula. Life Expectancy Calculator ONS-based estimate. Macro Calculator Protein/carb/fat split. Max Heart Rate Calculator Multiple formulae. Menopause Age Calculator Estimate from factors. Nap Calculator Optimal nap timing. One Rep Max Calculator Epley/Brzycki. Ovulation Calculator Fertile window from cycle. Period Calculator Next period prediction. Plank Time Benchmark Calculator Compare to age norms. Pregnancy Countdown Calculator Days remaining to due date. Pregnancy Due Date Calculator Naegele's rule from LMP. Pregnancy Trimester Calculator Which trimester + dates. Pregnancy Week Calculator Current gestational week. Pregnancy Weight Gain Calculator Recommended range by BMI. Press-Up / Push-Up Test Calculator Fitness percentile by age. Protein Intake Calculator g per kg bodyweight. Race Time Predictor Riegel formula. Recommended Daily Calories NHS 2000/2500 baseline. Resting Metabolic Rate Calculator RMR variant of BMR. Running Pace Calculator Pace/time/distance triangle. Sleep Calculator Bedtime by 90-min cycles. Smoking Cost Calculator Lifetime spend on cigarettes. Sober Time Calculator Hours until BAC zero. Steps to Calories Calculator Step count to kcal. Steps to Miles Calculator Stride-length based. Swimming Calorie Calculator Stroke-based MET. Target Heart Rate Calculator Karvonen method. VO2 Max Calculator Cooper / resting HR estimate. Waist-to-Height Ratio Calculator 0.5 threshold. Waist-to-Hip Ratio Calculator WHR + risk band. Walking Calorie Calculator Distance x weight. Water Intake Calculator Daily hydration estimate. Weight Loss Calculator Timeline to goal weight. Wilks Score Calculator Powerlifting coefficient.